Datasheet LTC7810 (Analog Devices) - 3

LTC7810
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1)
Input Supply Voltage (VIN) ... –0.3V to 150V TOP VIEW RUN1, RUN2 Voltages .. –0.3V to 150V + BOOST1, BOOST2 .. –0.3V to 150V SENSE1 V FB1 ITH1 TRACK/SS1 NC NC TG1 SW1 BOOST1 NC NC BG1 Switch Voltage (SW1, SW2) .. –5V to 150V 48 47 46 45 44 43 42 41 40 39 38 37 (BOOST1-SW1), (BOOST2-SW2) ..–0.3V to 11V EXTVCC Voltage ... –0.3V to 65V SENSE1– 1 36 NC DRV DRVSET 2 35 V CC Voltage ..–0.3V to 11V IN INTVCC 3 34 NC (NDRV-DRVCC) Voltage (Note 9) .. –0.3V to 6V PLLIN/SPREAD 4 33 NC PLLIN/SPREAD, FREQ Voltages ... –0.3V to 6V SGND 5 32 RUN1 FREQ 6 49 31 NC TRACK/SS1, TRACK/SS2 Voltages .. –0.3V to 6V REGSD 7 SGND 30 NC MODE 8 29 RUN2 ITH1, ITH2, V OVLO 9 28 NC FB1, VFB2, MODE Voltages ... –0.3V to 6V NDRV 10 27 NC OVLO, REGSD, DRVSET Voltages .. –0.3V to 6V EXTVCC 11 26 DRVCC SENSE1+, SENSE2+, SENSE1–, SENSE2– 12 25 PGND SENSE2– Voltages ... –0.3V to 65V BG1, BG2, TG1, TG2 ... (Note 10) 13 14 15 16 17 18 19 20 21 22 23 24 + Operating Junction Temperature Range (Notes 2, 8) NC NC NC NC V FB2 ITH2 TG2 SW2 BG2 LTC7810E, LTC7810I .. –40°C to 125°C SENSE2 BOOST2 TRACK/SS2 LTC7810H .. –40°C to 150°C LXE PACKAGE Storage Temperature Range .. –65°C to 150°C 48-LEAD (7mm × 7mm) PLASTIC eLQFP TJMAX = 150°C, θJA = 20°C/W EXPOSED PAD (PIN 49) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION LEAD FREE FINISH PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC7810ELXE#PBF LTC7810 48-Lead (7mm × 7mm) Plastic eLQFP –40°C to 125°C LTC7810ILXE#PBF LTC7810 48-Lead (7mm × 7mm) Plastic eLQFP –40°C to 125°C LTC7810HLXE#PBF LTC7810 48-Lead (7mm × 7mm) Plastic eLQFP –40°C to 150°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. Rev. A For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Main Control Loop Power and Bias Supplies (VIN, NDRV, EXTVCC, DRVCC, REGSD) Boost Supply and Dropout (BOOST and SW pins) Start-Up and Shutdown (RUN, TRACK/SS, OVLO Pins) Light Load Operation: Burst Mode Operation, Pulse Skipping or Forced Continuous Mode (MODE Pin) Frequency Selection, Spread Spectrum, and Phase-Locked Loop (FREQ and PLLIN/SPREAD Pins) Applications Information Current Sense Selection Low Value Resistor Current Sensing Inductor DCR Sensing Setting the Operating Frequency Selecting the Light-Load Operating Mode Inductor Value Calculation Inductor Core Selection Power MOSFET Selection CIN and COUT Selection Setting the Output Voltage RUN Pins and Overvoltage/Undervoltage Lockout Tracking and Soft-Start (TRACK/SS1, TRACK/SS2 Pins) Single Output Two-Phase Operation DRVCC Regulators Topside MOSFET Driver Supply (CB, DB) Burst Clamp Programming Fault Conditions: Current Limit and Current Foldback Fault Conditions: Overvoltage Protection (Crowbar) Fault Conditions: Overtemperature Protection Phase-Locked Loop and Frequency Synchronization Minimum On-Time Considerations Efficiency Considerations Checking Transient Response Design Example PC Board Layout Checklist PC Board Layout Debugging Typical Applications Package Description Revision History Typical Application Related Parts